Παραπομπή APA

Kippenhahn, R. (1999). Code breaking: A history and exploration. Universities press.

Παραπομπή Chicago Style

Kippenhahn, Rudolf. Code Breaking: A History and Exploration. Hyderabad: Universities press, 1999.

Παραπομπή MLA

Kippenhahn, Rudolf. Code Breaking: A History and Exploration. Universities press, 1999.